Shape Exclude
<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" x:Class="Microsoft.Samples.Graphics.RectangleExample" Title="Example"> <Window.Resources> <RectangleGeometry x:Key="rect" Rect="0 0 100 100"></RectangleGeometry> <EllipseGeometry x:Key="ellipse" Center="85 50" RadiusX="65" RadiusY="35"></EllipseGeometry> </Window.Resources> <Canvas> <Path Grid.Row="3" Fill="Yellow" Stroke="Blue" Margin="5"> <Path.Data> <CombinedGeometry GeometryCombineMode="Exclude" CombinedGeometry.Geometry1="{StaticResource rect}" CombinedGeometry.Geometry2="{StaticResource ellipse}"> </CombinedGeometry> </Path.Data> </Path> <TextBlock Margin="10" VerticalAlignment="Center">Exclude</TextBlock> </Canvas> </Window>